<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <progress max="100" value="30"></progress>
    <!--播放音频-->
    <audio src="source/music.m4a" controls="controls"></audio>
    <!--播放视频-->
    <video src="source/BigBuck.m4v" controls="controls"></video>
</body>
</html>